.SECONDEXPANSION:

obfn1=/./.
#obfn=$(obfn1)$(eval obfn1=$(patsubst /.//////%,/.//./%,$(subst /.//////,//./,$(obfn1)/)))
define obfn
$(obfn1)$(eval 
pr$(obfn1)=$1
cmd$(obfn1)=$2
obfn1=$(subst /.//////,//./,$(patsubst /.//////%,/././%,$(obfn1:.=/.)))
)
endef

digits=0 1 2 3 4 5 6 7 8 9

%yxxx: $(foreach d,$(digits),%$dyxx)
	
%yxx: $(foreach d,$(digits),%$dyx)
	
%yx: $(foreach d,$(digits),%$dy)
	
%y: $$(call obfn,FORCE,$$$$(info Running $$@ $$$$@))
	
/./%: $$(pr$$@)
	$(cmd$@)
FORCE: